[MacPorts] #53940: github PG: livecheck only latest release

[MacPorts]

#53940: github PG: livecheck only latest release
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  Reporter:  l2dy         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 We probably don't need another exposed option for this. We can tie it to
 the existing `github.tarball_from releases`.

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Ticket URL: <https://trac.macports.org/ticket/53940#comment:2>
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